The primary attraction of the Sanyo Pedal Juice is the inclusion of eneloop rechargeable battery technology. A brief summary of the advantages, over typical NiMHs, are more recharge cycles(1500 opposed to 1000), significantly less self discharge over time(<10% over 3 years), and lower tempature operation. These may or may not be advantages for the audio application you have in mind. They are significant advantages in other applications such as cameras and flashlights.